Free spectral range and quality factor enhancement of multi-path optical ring resonator for sensor application

Taufiqurrahman, Shidqie; Dicky, Gabriel; Estu, Topik Teguh; Daud, Pamungkas; Mahmudin, Dadin; Anshori, Isa

doi:10.1063/5.0014960

Cited by 5 publications

(5 citation statements)

References 12 publications

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“…Both the higher number of round trips and the light-sample interaction translates itself in terms of higher sensitivity and resolution of the optical sensor. An optical resonator sensor with a high FSR has a well-differentiated resonance mode signal and can detect small changes in the concentration [ 73 , 74 , 75 ]. In the case of our proposed FP-type linear resonator-based RI sensor, as its length varies, resulting in an increase in Q-factor at the expense of reduced FSR, as governed by Equation ( 2 ).…”

Section: Resultsmentioning

confidence: 99%

Broadband-Tunable Vanadium Dioxide (VO2)-Based Linear Optical Cavity Sensor

Ayaz,

Balazadeh Koucheh,

Sendur

2024

Nanomaterials

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Sensors fabricated by using a silicon-on-insulator (SOI) platform provide promising solutions to issues such as size, power consumption, wavelength-specific nature of end reflectors and difficulty to detect ternary mixture. To address these limitations, we proposed and investigated a broadband-thermally tunable vanadium dioxide (VO2)-based linear optical cavity sensor model using a finite element method. The proposed structure consists of a silicon wire waveguide on a silicon-on-insulator (SOI) platform terminated with phase-change vanadium oxide (VO2) on each side to provide light confinement. A smooth transmission modulation range of 0.8 (VO2 in the insulator state) and 0.03 (VO2 in the conductive phase state) in the 125 to 230 THz spectral region was obtained due to the of Fabry–Pérot (FP) effect. For the 3.84 μm cavity length, the presented sensor resulted in a sensitivity of 20.2 THz/RIU or 179.56 nm/RIU, which is approximately two orders of magnitude higher than its counterparts in the literature. The sensitivity of the 2D model showed direct relation with the length of the optical cavity. Moreover, the change in the resonating mode line width Δν of approximately 6.94 THz/RIU or 59.96 nm/RIU was also observed when the sensor was subjected to the change of the imaginary part k of complex refractive index (RI). This property of the sensor equips it for the sensing of aternary mixture without using any chemical surface modification. The proposed sensor haspotential applications in the areas of chemical industries, environmental monitoring and biomedical sensing.

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Section: Resultsmentioning

confidence: 99%

Broadband-Tunable Vanadium Dioxide (VO2)-Based Linear Optical Cavity Sensor

Ayaz,

Balazadeh Koucheh,

Sendur

2024

Nanomaterials

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Section: Resultsmentioning

confidence: 99%

“…In that case, Wg that can be represented by the coupling coefficient will become the key factor to determine the coupling. In fact, Q may change with Wg, which is attributed to the variation in the coupling coefficient between the ring and bus waveguide [30]. With the same method, the remaining power in the racetrack MRR are investigated as a function of the DC coupler gap W g , when GSST is in the amorphous and crystalline state, respectively.…”

Section: Structurementioning

confidence: 99%

Optical Switch Based on Ge2Sb2Se4Te1-Assisted Racetrack Microring

Liu

et al. 2022

Photonics

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In this work, we have proposed and designed a 1 × 1 optical switch based on the optical phase-change material, Ge2Sb2Se4Te1 (GSST), for GSST-assisted silicon racetrack microring. Its optical power can periodically be exchanged between the straight silicon waveguide and the GSST/Si hybrid racetrack waveguide due to the formed directional coupling structure. By changing GSST from the crystalline state to the amorphous state, the switch shifts from the ON state to the OFF state, and vice versa. With finite-difference time-domain method optimization, the proposed switch shows an extinction ratio of 18 dB at 1547.4 nm. The insert losses at the ON and OFF states are both less than 1 dB. The proposed switch unit has the potential to build an N × N switch matrix.

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“…The higher the value of FSR, the longer the distance between resonance signals peaks. This condition increases the MRR sensor's ability to differentiate each resonance signal and detect minimal changes in refractive index [51]. Figure 5 shows the output spectrum of CAD configuration from the drop port.…”

Section: All-optical Sensing Performancementioning

confidence: 99%

Enhancing Vernier Effect through Integrated Add-Drop Microresonator for High Sensitivity All-Optical Sensing

Azrisham,

Aman,

Noorden

et al. 2024

Preprint

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The Vernier effect has recently sparked a lot of interest study in high sensitivity sensing due to its ability to suppress interstitial peaks and broaden the Free Spectral Range (FSR). An analytical simulation system was constructed to incorporate an add-drop Micro Ring Resonator (MRR) waveguide with partial reflecting air holes into the bus waveguide to acquire the interferometric resonance and generate the Vernier effect. The system was developed based on the scattering matrix method and the Optical Transfer Function (OTF). A comparison analysis has been conducted between Conventional Add-Drop (CAD) MRR and Interferometric Add-Drop (IAD) MRR configurations to measure the improved sensitivity. The spectrum was analyzed based on the FSR and the wavelength shift by the change of the refractive index. Both CAD and IAD-MRR have been optimized by varying the radii of the ring and the distance between the air holes in the bus waveguide. The optimized IAD configuration demonstrates a 166.11% enhancement in FSR value and yields higher sensitivity by 17.07% via the implementation of the reflecting holes in the bus waveguide. The IAD-MRR configuration also generated a higher Q factor value of more than four times than the CAD-MRR. These findings emphasize the potential of interferometric resonance in enhancing the Vernier effect thus achieving better performance of all-optical sensing applications.

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Free spectral range and quality factor enhancement of multi-path optical ring resonator for sensor application

Cited by 5 publications

References 12 publications

Broadband-Tunable Vanadium Dioxide (VO2)-Based Linear Optical Cavity Sensor

Broadband-Tunable Vanadium Dioxide (VO2)-Based Linear Optical Cavity Sensor

Optical Switch Based on Ge2Sb2Se4Te1-Assisted Racetrack Microring

Enhancing Vernier Effect through Integrated Add-Drop Microresonator for High Sensitivity All-Optical Sensing

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